If you prepare capital of 500 rupees and withdraw a profit of 150 rupees, it equivalent to a monthly income of 4,500 rupees.
If you prepare 5,000 rupees in capital and make a profit of 1,500 rupees, you can withdraw it, which is equivalent to a monthly income of 45,000 rupees.
If you prepare 50,000 rupees in capital and withdraw a profit of 15,000 rupees, it equivalent to a monthly income of 450,000 rupees.
Clearly, your income is low because you have less money.